What does just mean in this sentence?

[Ranyp]

English Grammar Tests, Elementary Level

ESL/EFL Test #111 "Postcard: Holiday", question 3

It's only a small window really and we can only ......... see the sea.

(a) just
(b) about
(c) actually

English Grammar Tests, Elementary Level

ESL/EFL Test #111 "Postcard: Holiday", answer 3

It's only a small window really and we can only just see the sea.

Correct answer: (a) just
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I don't know clearly the word just.

[Alan]

Hi,

The word 'just' suggests 'only with difficulty' here because the window is very small.

Alan
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English as a Second Language
You can read my ESL story Head expressions for you

[Cisco795]

Teacher Alan, good evening.
The use of "only just" is unclear for me, would you please be as kind to explain further?

To me it looks like an "overlapping idea".
I think of these two word as synonyms, please correct me if I am wrong.

Thanks a lot and good night.
God bless.
Cisco.
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